A plateau is formed by a process of geological uplift, either due to the collision of continental plates, pressure from magma below or the burial of land by volcanic lava and ash flows, resulting in a high, flat surface. These are very similar to processes that give rise to mountains and mountain ranges. The only major difference is that a plateau is flat while mountains are peaked.Know More
Plateaus are found all over the world. The Colorado plateau in the United States is an example of a plateau formed by volcanic activity. These plateaus show a great abundance of volcanic rocks and other telltale signs. The other two types only have the marks of the terrain before they were uplifted.
One of these is the Ethiopian Plateau in Africa, which was created by magma uplift. This plateau and other similar plateaus often do not show any signs of volcanism, as these signs only occur when magma actually breaks through.
The last type, and the one with the greatest potential elevation, is the crustal collision type. One well-known example of this is the Tibetan plateau. This plateau, and others like it, can be so high that they are forbidding for many forms of life, with thin air and cold temperatures.Learn more about Geology
Rhyolitic magma has the greatest silica content, with silica making up about 70 percent of the magma. Basaltic and andesitic magma have lower silica contents at 50 percent and 60 percent, respectively.Full Answer >
Rocks come from magma, which is the molten material found within the earth. When magma cools, either above or below the earth's surface, it crystallizes and forms the igneous rocks that can later be changed into metamorphic or sedimentary rocks. Magma, which can be considered molten rock, is referred to as lava when it reaches the earth's surface.Full Answer >
Composite volcanoes, also known as stratovolcanoes, are formed by the gradual deposition of alternating layers of volcanic lava and ash. When volcanoes erupt, emitting lava that flows very slowly, the lava cools and hardens, forming conical shaped composite volcanoes after multiple eruptions over a span of hundreds of years.Full Answer >
Foliated metamorphic rocks are rocks that have gone through extreme temperature and pressure changes, resulting in a different chemical composition. They are distinct for the appearance of a layered pattern throughout the rock.Full Answer >